What is a purpose of the automatic bus...

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Question 1 of 2066636eed28f7522a1c51d94c

What is a purpose of the automatic bus transfer device shown in the illustration? Illustration EL- 0014

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66636eed28f7522a1c51d94c

What is a purpose of the automatic bus transfer device shown in the illustration? Illustration EL- 0014

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🔍 Key Concepts

• Trace the power flow paths on the one-line diagram, especially around the Automatic Bus Transfer Device (ABT). • Notice which equipment is labeled emergency versus main and how the emergency generator ties into the system. • Think about the basic function of an automatic bus transfer: what bus is it trying to keep energized when the normal source fails?

💭 Think About

• Follow what happens if the main 450 VAC source is lost: which bus must remain powered automatically for safety? • Ask yourself: does the ABT feed the main switchboard from the emergency side, or does it feed the emergency switchboard from the normal side under normal conditions? • Look at the connection of the emergency generator: does it connect directly to the emergency bus, or through the ABT? What, then, is the ABT actually switching between?

✅ Before You Answer

• Verify which bar in the drawing is labeled Emergency Swbd. 450 VAC Section and which is Main Swbd. 450 VAC Section. • Check the arrows/lines around the ABT symbol: identify the normal source, the emergency source, and the load bus it is protecting. • Confirm whether any option incorrectly suggests feeding the main bus from the emergency bus, instead of keeping the emergency bus alive when normal power is lost.

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Question 1 of 2066636eed28f7522a1c51d94c

What is a purpose of the automatic bus transfer device shown in the illustration? Illustration EL- 0014

Back

Question 1 of 20

66636eed28f7522a1c51d94c

What is a purpose of the automatic bus transfer device shown in the illustration? Illustration EL- 0014

No comments yet

Be the first to share your thoughts!

If the question has a related picture, it will appear here.

🔍 Key Concepts

💭 Think About

✅ Before You Answer

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